The skin of a non-metallic expansion joint is typically a composite material composed of multiple layers of different materials to absorb axial, transverse, or angular displacement in a piping system. When it is necessary to bond or replace the skin on site, the following steps are typically followed:
Check and prepare：
Check the appearance of the skin to verify there are no scratches, breakages, or other defects.
Verify that the skin size matches where the expansion joint is installed.
Positioning and deployment：
The outer layer of the skin (usually silicone cloth) faces outward around the expansion joint where the skin needs to be installed.
Make sure the ends are aligned, leaving proper allowance for subsequent bonding and stitching.
Layer-by-layer docking：
Butt the skin layers layer by layer in order from inner layer to outer layer.
When butting, ensure that each layer of material is flat and wrinkle-free to avoid the formation of voids or bubbles.
suture：
The inner layers of the skin are stitched together using appropriate wire and sewing techniques.
Note that the suture should not penetrate the outer silicone cloth, so as not to affect the sealing performance of the skin.
Adhesive outer layer：
Apply a special skin adhesive to one side of the outer silicone cloth.
Cover the silicone cloth on the other side to ensure that the adhesive surfaces are in close contact to exclude air.
Apply appropriate pressure using appropriate tools or methods to bring the adhesive surfaces into full contact.
Curing and Inspection：
Wait for sufficient curing time according to the instructions for the adhesive.
Check the bonding site to ensure there is no cracking or degumming.
Final Inspection and Installation：
Finally check the installation of the entire skin to make sure there are no omissions or errors.
Install the expansion joint into the piping system, secure and adjust to specification.
When carrying out the above steps, pay attention to the cleanliness of the working environment to avoid dust, oil and other impurities affecting the bonding effect. At the same time, all tools and materials used should meet the relevant safety and quality standards. If you have any questions about the operation process, you should refer to the manufacturer's instruction manual or seek the help of professional technicians.